Wheel Bearing spacers fit between inner and outer bearings. Preventing over tightening and consistently setting bearing preload while reducing bearing drag. US Patent No. 6,312,162.;
Allstar Performance ALL72323-4 Wheel Bearing Spacer - Steel - 5x5 Hubs w/2.0in Pin - Set of 4
Wheel Bearing spacers fit between inner and outer bearings. Preventing over tightening and consistently setting bearing preload while reducing bearing drag. US Patent No. 6,312,162.;